I'd suggest looking for official recommendations or reading reviews. Many times, they'll tell you the right place to pick up the manga after finishing the anime. You could also ask fellow fans for their advice.
Some popular options for reading Tomodachi Game manga after the anime include well-known manga subscription services like Crunchyroll Manga or Shonen Jump. They often have a wide range of manga titles available.
Some people might prefer the anime because it's more accessible and easier to consume in a shorter amount of time. However, others who are die - hard fans of the story and want to explore every nuance might lean towards the light novel. In the end, it really varies from person to person based on what they value more in a story - telling medium.
One main difference is the pacing. In the light novel, there is often more time to develop the characters' inner thoughts and backstories. For example, Kodaka's complex feelings about his past and his relationships can be explored in greater depth. In the anime, due to time constraints, some of these aspects might be simplified. Another difference is the visual and auditory experience. The anime brings the characters to life with voice acting and animation, which can add a new dimension to the humor, like when Sena's tsundere moments are animated in a more vivid way compared to just reading about them in the light novel.